Sorry for the confusion. When I try to put in a header image, WordPress says it will crop it to 360 × 164. This is much smaller than the 1140 you mention.
However, it is accomplished, I want the site to look like this: http://www.jonloomer.com/
It looks like he uses a wide image.
I played with the #head-wrap you mention. That changes the background of the menu bar. I want them menu bar a different color than the header above it. Again, like http://www.jonloomer.com/
Thanks